Optimal Design of Mining Panels for Truck Shovel Operations in Large Open Pit

In the planning phase, the entire surface area is usually divided into mining panels which are later mined and reclaimed with a particular sequence. Panel dimensions and their relative orientations affect in-pit waste haulage distance, stripping ratio, production efficiency, and facility layout. Generally, for the same production rate of coal, reduction of panel width will … Read more

Column Flotation of Copper

A column flotation system was designed to conduct release analyses of a very finely disseminated, stratiform, copper ore from the Denali Copper Prospect, Alaska. Chalcopyrite is finely disseminated in a carbonate matrix and pyrite is disseminated in both the chalcopyrite and gangue, requiring grinding to 20 microns for adequate liberation. The ore is almost entirely … Read more

Grinding Circuit Expansion

Increasing ore hardness led to a gradual reduction of mill throughput rates. This, combined with declining head grades and low gold price, prompted a review of milling practice at Kidston. Plant trials and computer simulation of the grinding circuit indicated the potential to increase mill throughput by up to 45% by reducing SAG mill feed … Read more

Adsorption Behavior of Oleate

The adsorption behavior of sodium oleate on brucite, Mg(OH)2, has been studied by Fourier transform infrared spectroscopy. Both internal reflection and diffuse reflection (DRIFT) methods were used to characterize the adsorbed oleate on brucite. DRIFT measurements were shown to be quantitative, and an equilibrium adsorption isotherm was obtained. The conformational behavior of the adsorbed oleate … Read more

Linear Systems Copper Heap Leaching

Chile is the world’s largest copper producer and as such sets the standard of practice in copper SX/EW design. The authors summarize the liner systems used at many of Chile’s major copper producers – both operating and planned. The evolution in the state of the art is also discussed, considering both economic factors and Chile’s … Read more

Limestone for Sulfur Removal

Reconnaissance sampling of high calcium (HC) limestones in New Mexico has been reported by Siemers (1982), Jicha (1956), and Kottlowski (1962). Numerous articles describe the limestone units in and near the state, such as Armstrong (1958) for west-central New Mexico, Mississippian and Pennsylvanian Systems in the state (Armstrong, and others, 1979), Pennsylvanian units in south-central … Read more

Copper Bioleach using Thiobacillus and Nutrient Additions

A new bacterium, Thiobacillus cuprinus, can extract copper from chalcopyrite as rapidly as T. ferrooxidans. On solution with and without nutrient amendments and bacterial growth media were supplemented with T. ferrooxidans or T. cuprinus in shake flask studies. Both species extracted -42% of the copper using growth media. In one case, T. cuprinus solubilized approximately … Read more

Elimination of Toxic Factors in Leachate – Biooxidation of Sulfide Ores

Toxic substances in On solutions can retard biological leaching of copper sulfide dump ores. On solutions were analyzed for metals, organics, and chloride, and showed inhibitory concentrations of aluminum, manganese, and chloride. Inhibition of bacterial activity by the solid fraction of On solution, with and without the organic constituents, was evaluated. Materials and Methods The … Read more

Nitrate Concentrations Prediction in Tailings Effluent

The disposal of spent ore from cyanide heap-leach processing facilities is of concern to the mining industry, regulatory agencies, and the public. Disposal of several hundred million tons of additional spent ore is planned in the western United States during the next decade, with increased amounts likely if gold prices rise. In the past decade, … Read more